The Dallas Cowboys should have some new emphasis on defense under new coordinator Mike Nolan and the rest of his staff, which only features one holdover from last season in Leon Lett. We’re not exactly sure how things will look, but we are certain that Nolan wants the best roster he can get. He is planning on keeping a 4-3 scheme. However, that is not as significant as many make it out to be, and he and Jim Tomsula are likely to throw in some 3-4 ideas at times. What they will definitely need is talent to rush the passer, and defensive end is just one more place Dallas has some important holes to fill.